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CVE-2026-35405

Protocol Libp2p denial of service

7.5 HIGHPublic exploitEPSS 0.49%
  1. Published7 Apr 2026

Description

libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to 0.17.1, libp2p-rendezvous server has no limit on how many namespaces a single peer can register. A malicious peer can just keep registering unique namespaces in a loop and the server happily accepts every single one allocating memory for each registration with no pushback. Keep doing this long enough (or with multiple sybil peers) and the server process gets OOM killed. This vulnerability is fixed in 0.17.1.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Protocol Libp2p< 0.17.1

Remediation

Fixed in
Protocol Libp2p≥ 0.17.1

References

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Frequently asked

Is CVE-2026-35405 being actively exploited?

CVE-2026-35405 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.49%.

How severe is CVE-2026-35405?

CVE-2026-35405 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.49% probability of exploitation.

Which products are affected by CVE-2026-35405?

Affected products include Protocol Libp2p.

How do I fix CVE-2026-35405?

Upgrade affected software to a fixed version, for example Protocol Libp2p 0.17.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.